CN1333394C - Focusing-searching device and method thereof - Google Patents

Focusing-searching device and method thereof Download PDF

Info

Publication number
CN1333394C
CN1333394C CNB2003101148050A CN200310114805A CN1333394C CN 1333394 C CN1333394 C CN 1333394C CN B2003101148050 A CNB2003101148050 A CN B2003101148050A CN 200310114805 A CN200310114805 A CN 200310114805A CN 1333394 C CN1333394 C CN 1333394C
Authority
CN
China
Prior art keywords
signal
output
wave
focused search
sine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB2003101148050A
Other languages
Chinese (zh)
Other versions
CN1499499A (en
Inventor
金济国
李锡政
张荣旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR10-2002-0068859A external-priority patent/KR100486277B1/en
Priority claimed from KR10-2002-0068860A external-priority patent/KR100498455B1/en
Priority claimed from KR10-2002-0069418A external-priority patent/KR100505647B1/en
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of CN1499499A publication Critical patent/CN1499499A/en
Application granted granted Critical
Publication of CN1333394C publication Critical patent/CN1333394C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/08505—Methods for track change, selection or preliminary positioning by moving the head
    • G11B7/08511—Methods for track change, selection or preliminary positioning by moving the head with focus pull-in only

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

Provided are focus search apparatus and method for performing a focus search after moving an optical pickup to focus-on point according to a signal output from a sine wave generator so that a stable and smooth focus search is performed. In the focus search method, a sine wave is generated in response to a focus search command. The focus search is performed using an optical pickup in response to the sine wave. The optical pickup is driven in response to an amplitude of the sine wave during the focus search and in response to filtered focus error signal during a focus servo.

Description

The focused search apparatus and method
The right of priority that korean patent application 2002-68860 number that the application requires to submit on November 7th, 2002 in Korea S Department of Intellectual Property korean patent application was submitted on November 7th, 2002-68859 number 1 and the korean patent application of submitting on November 9th, 2002 are 2002-69418 number is incorporated its disclosure integral body into by reference at this.
Technical field
The focused search waveform generator that the present invention relates to a kind of focused search device, focused search method and in optical system, use, be specifically related to a kind of focused search apparatus and method, by it, optical pickup device is moved to focus point in response to the signal of exporting from the sinusoidal waveform generator, carries out focus servo thereafter.
Background technology
Fig. 1 is the block scheme of the focus servo operation of the general optical system of principle diagram.With reference to Fig. 1, optical pickup device 20 reads the data that are recorded on the CD 10.Focus loop wave filter 30 receives from the focus error signal FE of optical pickup device 20 outputs, and is used for the focusing output drive signal FOD of focus servo in response to the driver (not shown) output of described focus error signal FE in being installed in optical pickup device 20.At this, LD and PD represent laser diode and photodiode respectively.
Fig. 2 shows from the waveform of the signal of focus loop wave filter shown in Figure 1 30 outputs.At this, signal is a triangular wave.On general the use/following counter (not shown) generation triangular wave.
Referring now to Fig. 1 and 2 traditional focused search and focus servo are described.For to CD 10 tracer signals or from CD 10 replay signal, must pass through focus servo control optical pickup device 20.
If optical pickup device 20 is near the focal position on the CD 10, then optical pickup device 20 can produce S shape focus error signal FE.And, if optical pickup device 20 is positioned at and the maximal value and the pairing scope of the scope between the minimum value of S shape focus error signal FE in, optical pickup device 20 can be carried out focus servo.
Therefore, in order to carry out focus servo, before focus servo, optical pickup device 20 must move to the position in the scope that wherein may carry out focus servo.That is, optical pickup device 20 must move to the position in the scope corresponding with the maximal value of S shape focus error signal FE and the scope between the minimum value.This operation is called as focused search.
For example, in the part a of the curve of Fig. 2, optical pickup device 20 is removed downwards from CD 10.In part b, optical pickup device 20 moves to CD 10.In part b, optical pickup device 20 is carried out focused searchs and subsequently from focus point, promptly wherein focus error signal FE is that 0 point is carried out focus servo.Therefore, if after focus point, i.e. focused search success, this waveform is to be used to make optical pickup device 20 to carry out the signal of focus servos.
See figures.1.and.2 owing in traditional focus servo, use triangular wave since when carrying out focused search since the object lens of the fluctuation optical pickup device 20 of voltage vibrate.And when very big and level focused search of the voltage difference of the maximal value of S shape focus error signal FE and minimum value is low, be difficult to the stable focus servo of carrying out.
For example, during part b, optical pickup device 20 is carried out focused search in focused search starting point (SSP).Optical pickup device 20 is also at focus point, and promptly focus error signal FE carries out focus servo on 0 the point.Therefore, the waveform behind focus point, if i.e. focused search success or focus on introduce (pull-in) after, be to be used to make optical pickup device 20 to carry out the signal of focus servos.
When carrying out focused search, promptly in part b, optical disc recording apparatus and/or disc reproducing apparatus extract such as about the data of laser disk (LD), compact disk (CD) and digital multi-purpose disk (DVD) type about the data of CD 10 or about whether take inventory data.
Yet when carrying out focused search, because focusing takes place in external action when losing (drop), the focused search device is once more from beginning to carry out focused search.
With reference to Fig. 2, when the focused search device was carried out focused search once more, the focused search device began focused search from SSP.Therefore, need a considerable amount of times from beginning to carry out focused search.And, when using triangular wave to carry out focused search, if the speed of focused search improves, then the object lens (not shown) of optical pickup device 20 vibrates, if the speed of focused search reduces to avoid the vibration of optical pickup device 20, then the execution focused search after focusing is dropped needs a large amount of time.
Generally, optical system, promptly optical disc recording apparatus and/or disc reproducing apparatus are to such as CD (or optical recording media) record data of CD or DVD etc. or from its replay data.
Fig. 3 is the schematic block diagram of traditional disc reproducing apparatus.With reference to Fig. 3, disc reproducing apparatus 300 comprises CD 310, spindle drive motor 320, optical pickup device 330, focus servo 340, track seek servo 350, main axle servo 360 and controller 370.
Optical pickup device 330 is to CD 310 illuminating laser beams, and according to from CD 310 laser light reflected bundle outputting data signals, focus error signal and tracking error signal.Focus servo 340 detection of focus error signals and in response to this] focus error signal and in depth of focus scope, drive the object lens (not shown) of optical pickup device 330.Track seek servo 350 detects the tracking error signal, and follows the trail of the tracking road in response to the tracking error signal.(follow?the?track)
The spindle drive motor 320 of main axle servo 360 control rotary CDs 310.The integrated operation of controller 370 control focus servos 340, track seek servo 350, main axle servo 360.
In order stably to carry out best track seek servo and/or focus servo, the disc reproducing apparatus of carrying out aforesaid operations must Control Servo System, be the gain of track seek servo and/or focus servo.
And, consider the trend of compression and light and handy optical disk data reproducing device, servo-drive system and use the disc reproducing apparatus of servo-drive system must be light and the power of consumption smallest number.
Summary of the invention
The present invention also provides a kind of apparatus and method of the annular gain that is used for Control Servo System, and described servo-drive system comprises that the track seek servo that is used for optical system and/or focus servo are to improve the stability of optical system.
The present invention also provides a kind of and has been used for sinusoidal waveform generator in the servo-drive system that optical system embeds to realize optical system light and handy and that consume the power of smallest number.
The present invention also provides a kind of can the minimizing to focus on drop needed time method of laggard line focusing and device in optical system.Promptly, should focus on to fall to fall behind in this and carry out focused search then carry out the method for focused search if the present invention also relates to a kind of being used for, and relate to the focused search waveform generator that is used to carry out described method from the low-pass filter signal of Self-focusing ring mode filter output.Therefore, the invention provides a kind of focused search device and a kind of method, this method is used for after optical pickup device is moved to focus point according to carrying out focus servo so that carry out the method for stable and level and smooth focused search from the signal of sine-wave producer output.
According to one aspect of the present invention, provide a kind of focused search method.Produce sine wave in response to the focused search order.Use optical pickup device to carry out focused search in response to sine wave.
According to another aspect of the present invention, also provide a kind of focused search method.Produce sinusoidal wave.Use to CD in response to the amplitude of sine wave and to rise or carry out focused search from the optical pickup device that CD descends.
According to another aspect of the present invention, also provide a kind of focused search method.Use to CD in response to the amplitude of the sine wave that produces by sine-wave producer and to rise or carry out focused search from the optical pickup device that CD descends.After successfully carrying out focused search, use optical pickup device to carry out focus servo.
According to another aspect of the present invention, a kind of focused search device also is provided, it comprises sine-wave producer, switch and driver.Described sine-wave producer produces sinusoidal wave.Described switching response is optionally exported in control signal from one of the signal of sine-wave producer output and focus error signal of filtering.Described actuator response drives optical pickup device in the signal of exporting from described switch.
According to another aspect of the present invention, a kind of focused search device also is provided, comprise sine-wave producer, focusing ring mode filter, focus condition detecting device, switch and driver.Sine-wave producer produces sinusoidal wave.The focusing ring mode filter receives and the filtering focus error signal, and the focus error signal of output filtering.Focus condition detecting device collectiong focusing OK signal and focus error signal detect focus condition, and output is corresponding to the control signal of testing result.Switching response is optionally exported in control signal from the signal of sine-wave producer output with from one of signal of focusing ring mode filter output.Actuator response drives optical pickup device in the signal from switch output.
According to another aspect of the present invention, also provide a kind of focused search method.Receive a plurality of command signals, and detect focus condition.If do not satisfy focus condition, use optical pickup device to carry out focused search in response to the sine wave that produces by sine-wave producer, and if satisfy focus condition, then use optical pickup device to carry out focus servo in response at least one of a plurality of command signals.
According to another aspect of the present invention, also provide a kind of focused search method.Reception, low-pass filtering and the signal that output is exported from the focusing ring mode filter during focusing.Addition is used for the waveform of focused search and the signal of low-pass filtering during focused search.At this, begin focused search from low-pass filter signal.
According to another aspect of the present invention, also provide a kind of focused search method.Drive optical pickup device in response to signal during focusing from the output of focusing ring mode filter.At this, begin focused search from the signal of low-pass filtering.
According to another aspect of the present invention, also provide a kind of focused search method.Drive optical pickup device in response to signal during focusing from the output of focusing ring mode filter.If generation focusing is dropped and carried out focused search once more after focusing, then use optical pickup device before generation is dropped in focusing, during focusing, to carry out focused search immediately from the signal of focusing ring mode filter output.
According to another aspect of the present invention, also provide a kind of focused search method.Calculating during focusing from the mean value of the signal of focusing ring mode filter output.Focusing is dropped and at this execution focused search, then produce the waveform of focused search if take place after focusing, and the waveform of addition focused search and described mean value.In predetermined focused search scope, carry out focused search according to mean value.
According to another aspect of the present invention, a kind of focused search waveform generator also is provided, it comprises wave filter, sine-wave producer, counter, amplifier and totalizer.Wave filter receives and the low-pass filtering input signal, and the signal of output low-pass filtering.Sine-wave producer produces sinusoidal wave during focused search.Counter is connected to sine-wave producer, receives sine wave, the point of the sign modification that counting is sinusoidal wave, and the result of output counting.Amplifier is connected to sine-wave producer, receives sine wave and controls sinusoidal wave amplitude in response to the signal of exporting from counter.Totalizer reception and addition are from the signal of the low-pass filtering of wave filter output and the signal of exporting from amplifier, and the result of output addition.
According to another aspect of the present invention, a kind of focused search waveform generator also is provided, comprise wave filter, level regulator, subtracter, totalizer, first amplifier, second amplifier, level range storer, waveform generator sum counter.Wave filter receives and the filtering input signal, and the signal of output low-pass filtering.The regulated value of level regulator output predetermined level.Subtracter receives from the low-pass filter signal and the level adjustment value of wave filter output, and deducts the level adjustment value from the low-pass filter signal from wave filter output.Totalizer reception and addition are from the signal and the level adjustment value of the low-pass filtering of wave filter output.First amplifier is connected to subtracter and controls from the gain of the signal of subtracter output in response to count signal.Second amplifier is connected to totalizer and controls from the gain of the signal of totalizer output in response to count signal.The signal that the level range storer receives and storage is exported from first and second amplifiers.Waveform generator is created in the triangular wave of swinging in the scope of the signal of level range storer output.Counter receives and relatively from the signal of waveform generator output with from the signal of level range storer output, and output is corresponding to the count signal of comparative result.At this, from the low-pass filter signal of signal from exporting of waveform generator output from wave filter.
According to another aspect of the present invention, also provide a kind of focused search method.Collectiong focusing OK signal and definite logic state that focuses on the OK signal.Produce according to definite result and to have the waveform that Different Slope is used for focused search.
According to another aspect of the present invention, also provide a kind of focused search method.Collectiong focusing OK signal.If focusing on the OK signal is logic " low ", then produce the waveform that is used for focused search with first slope, be logic " height " if focus on the OK signal, then produce waveform with second slope.
According to another aspect of the present invention, also provide a kind of controller that is used for the annular gain of Control Servo System.Described controller comprises sine-wave producer, first adder, loop filter, second adder, wave filter and difference detector mutually.Sine-wave producer produces sinusoidal wave.First adder receives and additive error signal and sine wave, and the output addition result.Loop filter receives from the signal of first adder output, controls from the gain of the signal of first adder output, and exports its controlled signal that gains.Second adder reception and additive error signal and the signal of exporting from first adder, and the result of output addition.The signal that wave filter receives and filtering is exported from second adder.The phase difference detector receives sinusoidal wave and from the signal that wave filter is exported, differing with fixed phase between signal sinusoidal wave and that export from wave filter compared, and output is corresponding to the gain control signal of comparative result.At this, the gain of control loop mode filter in response to gain control signal.
According to another aspect of the present invention, a kind of sine-wave producer also is provided, it is used to produce sinusoidal wave annular gain with Control Servo System.Sine-wave producer comprises first multiplier, second multiplier, first adder, second adder, first delay cell, second delay cell and the 3rd multiplier.First multiplier has factor I.Second multiplier has factor.First adder reception and addition are from the signal of first multiplier output and the signal of exporting from second multiplier.Second adder receives and increase control signal and the signal exported from first adder mutually.First delay cell is connected between the input node of the output node of second adder and first multiplier, receives from the signal of second adder output, and will be from the signal delay preset time of second adder output.Second delay cell is connected between the input node of the input node of first multiplier and second multiplier, receives the input signal of first multiplier, and the input signal of first multiplier is postponed preset time.The 3rd multiplier has factor III, receives from the signal of second adder output, and sine wave output.
According to another aspect of the present invention, also provide a kind of method that is used for the gain of Control Servo System.Receive and additive error signal and the sine wave exported from sine-wave producer, the result of addition is exported as first signal.Receive first signal, control the gain of first signal, and export its controlled signal that gains.Receive and the additive error signal and first signal, addition result is exported as secondary signal.Receive and the filtering secondary signal, the result of filtering is exported as the 3rd signal.Receive sinusoidal wave and the 3rd signal, differing with fixed phase between sinusoidal wave and the 3rd signal compared, and output is as the comparative result of gain control signal.At this, control the gain of first signal in response to gain control signal.
Description of drawings
By the more specific description of a preferred embodiment of the present invention shown in the accompanying drawings, above-mentioned and other purposes, characteristics and advantage of the present invention will become clear, and in the accompanying drawings, in different views, same drawing reference numeral refers to same part.Described accompanying drawing is unnecessary proportional, focuses on the diagram principle of the present invention.
Fig. 1 is the schematic block diagram that is illustrated in the focus servo in the general optical system.
Fig. 2 illustrates from the waveform of the signal of focusing ring mode filter output shown in Figure 1.
Fig. 3 is the schematic block diagram of traditional disc reproducing apparatus.
Fig. 4 is the schematic block diagram according to focused search device of the present invention.
Fig. 5 illustrates and is used to use the waveform of carrying out the search signal of focused search according to focused search apparatus and method of the present invention.
Fig. 6 is the schematic block diagram of sine-wave producer shown in Figure 4.
Fig. 7 is that the process flow diagram of carrying out the processing of focused search according to focused search apparatus and method of the present invention is used in diagram.
Fig. 8 is the schematic block diagram that has according to the focused search device of the focused search Waveform generating circuit of one embodiment of the present of invention.
Fig. 9 is the schematic block diagram of focused search Waveform generating circuit shown in Figure 8.
Figure 10 illustrates from the waveform of the signal of focused search Waveform generating circuit output shown in Figure 9.
Figure 11 illustrates the waveform of the signal of switch output shown in Figure 8.
Figure 12 is the schematic block diagram that has according to the focused search device of the focused search Waveform generating circuit of an alternative embodiment of the invention.
Figure 13 is the schematic block diagram of focused search Waveform generating circuit shown in Figure 12.
Figure 14 illustrates from the waveform of the signal of focused search Waveform generating circuit output shown in Figure 12.
Figure 15 illustrates from the waveform of the signal of switch output shown in Figure 12.
Figure 16 is the schematic block diagram according to the annular gain controller that is used for servo-drive system of one embodiment of the present of invention.
Figure 17-the 19th, the figure of the input waveform of the annular gain controller that diagram is shown in Figure 16.
Embodiment
Fig. 4 is the schematic block diagram according to focused search device of the present invention.With reference to Fig. 4.Focused search device 400 comprises amplifier 410, totalizer 420, focusing ring mode filter 430, sine-wave producer 440, focus condition detecting device 450, switch 460, driver 470 and optical pickup device 480.
Amplifier 410 receives and amplifies from the focus error signal FE of optical pickup device 480 outputs, then the focus error signal that amplifies to totalizer 420 outputs.Totalizer 420 adds shifted signal OFFSET or deducts shifted signal OFFSET from the output signal of amplifier 410 to the output signal of amplifier 410, and to focusing ring mode filter 430 and focus condition detecting device 450 output signal OFE.At this, shifted signal OFFSET is used for removing the skew that comprises at focus error signal FE.
The signal OFE that focusing ring mode filter 430 receives and filtering is exported from totalizer 420 exports the signal of filtering to switch 460 then.Focusing ring mode filter 430 can be low-pass filter (LPF), and its gain NSK can be controlled by external device (ED).
Sine-wave producer 440 produces sinusoidal wave OSIN and to switch 460 sine wave output OSIN.When carrying out focused search, focus condition detecting device 450 collectiong focusing OK signal FOK and the signal OFE that exports from totalizer 420 detect predetermined focus condition, and export testing results as control signal to switch 460.
Switch 460 is exported from the sinusoidal wave OSIN of sine-wave producer 440 outputs or the signal of exporting from focusing ring mode filter 430 to driver 470 in response to the control signal of exporting from focus condition detecting device 450.
Driver 470 receives the signal SFOD that sends from switch 460, and is used for the signal of focused search or focus servo to the driver (not shown) output of optical pickup device 480.Optical pickup device 480 is in response to rising or from the focus error signal FE that CD descends, promptly carry out focused search to CD from the signal output of driver 470 output.
Fig. 5 illustrates and is used to use the waveform of carrying out the signal of focused search according to focused search apparatus and method of the present invention.That is, Fig. 5 shows from the signal of switch 460 outputs.
With reference to Fig. 4 and Fig. 5, according to focused search device 400 of the present invention in response to signal from sine-wave producer 440 output, i.e. the amplitude of sinusoidal wave OSIN and carry out focused search.
When carrying out focused search, switch 460 is in response to coming to send from the signal OSIN of sine-wave producer 440 outputs to driver 470 from the control signal of focus condition detecting device 450 outputs.
After successfully having carried out focused search, switch 460 sends from the signal of focusing ring mode filter output to driver 470.If in focusing or focused search success, the focus error signal FE that exports from optical pickup device 480 is 0.Therefore, after successfully having carried out focused search, optical pickup device 480 is carried out focused searchs with to CD recording signal or from the optical disk data reproducing signal.
Therefore, in response to when carrying out focused search from the signal OSIN of sine-wave producer 440 outputs with in response to the signal from 430 outputs of focusing ring mode filter in focused search success back, drive optical pickup device 480.
Fig. 6 is the schematic block diagram of sine-wave producer 440 shown in Figure 4.As shown in Figure 6, sine-wave producer 440 comprises a plurality of multipliers 4401,4407,4409 and 4415, a plurality of totalizer 4403 and 4405, a plurality of delay cell 4411 and 4413.At this, Ki, Ka, Kb and Ko represent gain or scale factor.A plurality of delay cells 4411 and 4413 can be d type flip flops.Sine-wave producer 440 produces sinusoidal wave OSIN in response to pulse signal IMP.The amplitude of sinusoidal wave OSIN or frequency can be different.
Multiplier 4401 received pulse signal IMP multiply each other pulse signal IMP and the scale factor K i that is scheduled to, and send the output of multiplied result to totalizer 4403.Totalizer 4403 additions are from the signal of multiplier 4401 output with from the signal of totalizer 4405 outputs, and send the output of addition result to multiplier 4415 and delay cell 4411.Multiplier 4415 receives from the signal of totalizer 4403 outputs, with described signal times with predetermined gain Ko, and based on holding the sinusoidal wave OSIN that the result produces to switch shown in Figure 4 460 outputs mutually.
Delay cell 4411 receives from the signal of totalizer 4403 outputs, with described signal delay preset time, and the signal that is delayed to totalizer 4407 and delay cell 4413 outputs.Delay cell 4413 receives from the signal of delay cell 4411 outputs, with described signal delay preset time, and to the signal of multiplier 4409 output delaies.Multiplier 4407 will be from the signal times of delay cell 4411 output with predetermined constant K a, and to totalizer 4405 input multiplied result.Multiplier 4409 will be from the signal times of delay cell output with predetermined constant K b, and to the result of totalizer 4405 output multiplications.
The theoretical background of the sine-wave producer 440 that explanation now is shown in Figure 6.
At first, provide the general z transformation equation that is used for second order wireless pulses response (IIR) wave filter by equation 1.
H ( z ) = Y ( z ) X ( z ) = ( b 0 + b 1 z - 1 + b 2 z - 2 ) ( 1 - a 1 z - 1 - a 2 z - 2 ) - - - ( 1 )
Wherein, denominator polynomial expression formula X (z) has two roots, and they are limits of second order iir filter.
If the limit of H (z) be the plural number, then they by equation 2 with polar coordinate representation.
P 1＝re jθ
P 2 = re - jθ = P 1 * - - - ( 2 )
Therefore, denominator polynomial expression formula X (z) is represented with polar coordinates (r and θ) by equation 3.
X(z)＝(1-P 1z -1)(1-P 2z -1)
＝(1-re jθz -1)(1-re -jθz -1) (3)
＝1-(re jθ+re -jθ)z -1+r 2z -2
＝1-(2rocosθ)z -1+r 2z -2
Equation 1 is converted into the equation 4 that uses equation 1.
H ( z ) = Y ( z ) X ( z ) = ( b 0 + b 1 z - 1 + b 2 z - 2 ) ( 1 - a 1 z - 1 - a 2 z - 2 )
= ( b 0 + b 1 z - 1 + b 2 z - 2 ) ( 1 - re jθ z - 1 ) ( 1 - re - jθ z - 1 )
= ( b 0 + b 1 z - 1 + b 2 z - 2 ) ( 1 - 2 r cos θ z - 1 + r 2 z - 2 ) - - - ( 4 )
Wherein, two feedback factors are represented by equation 5.
a 1＝2rcosθ (5)
a 2-r 2
Provide difierence equation by equation 6 corresponding to equation 1.
y(n)＝(2rcosθ)y[n-1]-r 2y[n-2]+b 0x[n]+b 1x[n-1]+b 2[n-2] (6)
Equation 1-6 is illustrated in the described limit of sine-wave producer and the relation between the feedback factor.For example, factor a only 1Be converted into the change angle of limit.Yet equation 5 is effective when two limits are conjugate complex number only.
In order to obtain continuous sine wave, by the limit of the sine-wave producer 440 of equation 1 expression must the unit circle in z-plane on.That is, r must be 1.Angle between limit is accurately consistent with the angular frequency of sine wave.Therefore, in equation 5, a 2Can be fixed to-1, a 1Can suitably be adjusted the frequency of controlling sine-wave producer 440.
For example, the frequency of the sinusoidal wave OSIN that is produced by sine-wave producer shown in Figure 6 440 is adjusted by constant a, and the amplitude of the sinusoidal wave OSIN Ko that gained adjusts.At this, Ka=2cos θ=2cos (2 π (ft/fs)), wherein ft represents target frequency, fs represents sample frequency.Therefore, Yu Ding constant K a can change.
Fig. 7 is that the process flow diagram of carrying out the processing of focused search according to focused search apparatus and method of the present invention is used in diagram.With reference to Fig. 4 and 7, in step 610, focused search device 400 begins focused search according to the focused search order.In step 620, sine-wave producer 440 produces sinusoidal wave OSIN, and to switch 460 sine wave output OSIN.In step 630, focus condition detecting device 450 collectiong focusing error signal FE and focusing OK signal FOK detect predetermined focus condition, and to the control signal of switch 460 outputs corresponding to testing result.Promptly, if focused search device 400 does not satisfy focus condition, be not successful execution focused search of focused search device 400, then switch 460 sends from the sinusoidal wave OSIN of sine-wave producer 440 outputs to driver 470 in response to the control signal of exporting from focus condition detecting device 450.Therefore, in step 640, driver 470 is carried out focused search, drives optical pickup device 480 in response to the sinusoidal wave OSIN that exports from sine-wave producer 440.
But, if detecting focusing, focus condition detecting device 450 is the result of focused search, then switch 460 sends from the signal of focusing ring mode filter 430 outputs to driver 470 in response to the control signal of exporting from focus condition detecting device 450.Therefore, in step 650, driver 470 is carried out focus servo, drives optical pickup device 480 in response to the signal of exporting from focusing ring mode filter 430.
As mentioned above, in according to focused search apparatus and method of the present invention, used sine wave.Therefore, can carry out stable and level and smooth focused search.
Fig. 8 is the block scheme that has according to the focused search device 700 with focused search waveform generator 740 of one embodiment of the present of invention.With reference to Fig. 8, the focused search device 700 that uses in optical system comprises amplifier 410, totalizer 420, focusing ring mode filter 430, focused search waveform generator 740, focus condition detecting device 450, switch 750, driver 470 and optical pickup device 480.
Amplifier 410 receives and amplifies from the focus error signal FE of optical pickup device 480 outputs, amplifies the result to totalizer 420 outputs then.At this, G represents the gain of amplifier 410, and it can Be Controlled.
Totalizer 420 adds shifted signal OFFSET or deducts shifted signal OFFSET from the signal of amplifier 410 outputs to the signal from amplifier 410 output, and it is offset controlled signal OFE to focusing ring mode filter 430 and 450 outputs of focus condition detecting device.
The OFE as a result that focusing ring mode filter 430 receives and filtering is exported from totalizer 420, and to switch 750 and focused search waveform generator 740 output signal LPO.
Focused search waveform generator 740 receives from the signal LPO of focusing ring mode filter 430 outputs, low-pass filter signal LPO during focusing, obtain low-pass filter signal, promptly from the mean value of the signal LPO of focusing ring mode filter 430 outputs, and when carrying out focused search to switch 750 output signal AFOD, promptly mean value and have predetermined amplitude sine wave and.Therefore, after focusing was dropped, the starting point of focused search was the focusing before generation is dropped in focusing.
When carrying out focused search, focus condition detecting device 450 collectiong focusing OK signal FOK and the signal OFE that exports from totalizer 420 detect predetermined focus condition, and to the control signal of switch 750 outputs corresponding to testing result.
Generally, focus condition refers to a kind of situation, wherein when focusing OK signal FOK is logic high, focuses on zero cross signal FZC and changes to the logic " low " state from the logic " high " state.
And, if, then focus on the introducing rate and improve in the speed of focusing control focused search.That is, if the speed of the focused search when focusing on OK signal FOK and be logic " low " faster than the speed of the focused search when focusing OK signal FOK is logic " height ", then focusing on the introducing rate can improve.
With reference to Fig. 1 and 8, when being logic " low ", OK signal FOK is used to drive the speed of optical pickup device 20 faster than the speed that when focusing OK signal FOK is logic " height ", is used to drive optical pickup device 20 when focusing on.When focusing on OK signal FOK and be logic " low ", the slope of waveform that is used to carry out focused search is greater than the slope of the waveform that is used to carry out focused search when focusing OK signal FOK is logic " height ".
Switch 750 is optionally exported from the signal AFOD of focused search waveform generator 740 outputs or the signal LPO that exports from focusing ring mode filter 430 in response to the signal of exporting from focus condition detecting device 450.
Switch 750 can be a multiplier, and when carrying out focused search, the signal of exporting in response to focus condition detecting device 450 sends from the signal AFOD of focused search waveform generator 740 outputs to driver 470.After focusing, switch 750 is also exported from the signal LPO of focusing ring mode filter 430 outputs in response to the signal of exporting from focus condition detecting device 450.
Driver 470 receives the signal SFOD that sends from switch 750, and is used to carry out the signal of focused search or focus servo to the driver (not shown) output of optical pickup device 480.Optical pickup device 480 descends to the CD lifting or from CD in response to the signal output focus error signal FE from driver 470 outputs, promptly carries out focused search.
Fig. 9 is the schematic block diagram of focused search Waveform generating circuit shown in Figure 8.With reference to Fig. 9, focused search waveform generator 740 comprises wave filter 7410, sine-wave producer 7420, amplifier 7430, counter 7440 and totalizer 7450.
Wave filter 7410 receive and filtering from the signal LPO of focusing ring mode filter 430 outputs, and export the signal LOUT of filtering to totalizer 7450.Wave filter 7410 is low-pass filters, and it obtains during focusing from the mean value LOUT of the signal LPO of focusing ring mode filter 430 outputs.
Therefore, during focusing, wave filter 7410 comes calculating mean value LOUT by integrated signal LPO from 430 outputs of focusing ring mode filter, and during focused search, keeps mean value LOUT.Therefore, after focused search success, take place to focus on and drop, and if focused search restart, then become the starting point of focused search from the signal of wave filter 7410 outputs.
Therefore, because the focused search device restarts focused search from the point that just focuses on before dropping in generation, therefore, and even the narrow range focused search device of focused search is also] can promptly search for focusing.Thereby the focused search device can promptly recover focus.
Wave filter 7410 comprises first amplifier 7411, totalizer 7413, delay cell 7415 and second amplifier 7417.The gain of first amplifier 7411 is Ko, and the gain of second amplifier 7417 is K1.First amplifier 7411 receives and amplifies from the signal LPO of focusing ring mode filter 430 outputs, and amplifies the result to totalizer 7413 outputs.
Totalizer 7413 receive and addition from the signal of first amplifier, 7411 outputs with from the signal of second amplifier, 7417 outputs, and export addition result to delay cell 7415 and totalizer 7450.Delay cell 7415 receives from the signal LOUT of totalizer 7413 outputs, and signal LOUT is postponed preset time, and to the signal of second amplifier, 7417 output delaies.Delay cell 7415 can be d type flip flop.
Only during focused search, sine-wave producer 7420 produces the sine wave with predetermined amplitude and frequency in response to predetermined pulse signal, and to amplifier 7430 sum counters 7440 sine wave outputs.
7440 pairs in counter is carried out inferior counting numbers of focused search, and the result who counts to amplifier 7430 outputs.At this, the number of times of carrying out focused search can be set in advance or be controlled by external device (ED).
The gain G N of amplifier 7430 is Be Controlled in response to the signal of exporting from counter 7440.Preferably the gain G N of amplifier 7430 is generally less than 1, and increases pro rata with the number of times of carrying out focused search.Therefore, the gain G N of amplifier 7430 determines sinusoidal wave amplitude.
During focused search, totalizer 7450 receive and addition from the signal LOUT of wave filter 7410 outputs and the signal of exporting from amplifier 7430, and to switch 750 output signal AFOD.
Figure 10 illustrates from the waveform of the signal of focused search waveform generator 740 outputs.With reference to Fig. 9 and 10, the number count of counter 7440 couples of some CP1, CP2, CP3, CP4 and the CP5 of sinusoidal wave sign modification during focused search.Quantity by the point of counter 7440 counting can be determined by the peripheral control unit (not shown).
Successfully do not carry out in the focused search scope under the situation of focused search, focused search, promptly the scope of sinusoidal wave amplitude improves gradually.
Figure 11 illustrates the waveform of the signal of switch shown in Figure 8 750 outputs.Drop because your generation of focused search success back focuses on, will be elaborated to Figure 11 according to Fig. 8 under the situation that focused search will restart.
The number of times of carrying out focused search is set in counter 7440.The number of times of execution focused search can be provided with by the user or can be used as default by the manufacturing company of focused search device 700.
If the focused search success, then optical pickup device 480 is driven in response to the signal of exporting from focusing ring mode filter 430.That is, focused search waveform generator 740 receive and low-pass filtering from the signal LPO of focusing ring mode filter 430 outputs, and to switch 750 output signal AFOD.Therefore, optical pickup device 480 is driven in fact in response to signal AFOD.
But, drop if take place to focus on, then focused search device 700 is carried out focused search once more.Therefore, switch 750 sends from the signal AFOD of focused search waveform generator 740 outputs to driver 470 in response to the signal of exporting from focus condition detecting device 450.
During focused search, sine-wave producer 7420 produce sinusoidal wave and in response to predetermined pulse signal to counter 7440 and amplifier 7430 sine wave outputs.Amplifier 7430 is controlled from the amplitude of the sine wave of sine-wave producer 7420 outputs in response to the signal of exporting from counter 7440.
Counter 7440 receives from the sine wave of sine-wave producer 7420 outputs, the number count of the point of the sign modification of offset of sinusoidal ripple, and the quantity of the point of being counted to amplifier 7430 outputs.Amplifier 7430 improves gain G N in response to the signal of exporting from counter 7440.
For example, if do not carry out focused search, between a CP1 and CP2, carry out focused search up to a CP1.If successfully carry out focused search in the scope between a CP1 and CP2, the signal LPO that focused search waveform generator 740 receives and filtering is exported from focusing ring mode filter 430 then, and to switch 750 output signal AFOD.At this, reset counter 7440.If successfully carry out focused search, reset counter 7440.
Drop and therefore restart under the situation of focused search take place focusing on once more, sine-wave producer 7420 produces sinusoidal wave once more, and the number count of the point of the sign modification of counter 7440 offset of sinusoidal ripples, and to the quantity of the point of amplifier 7430 output counting.Amplifier 7430 improves gain G N in response to the signal of exporting from counter 7440.
Totalizer 7450 additions are from the signal LOUT of wave filter 7410 output with from the signal of amplifier 7430 outputs, and to switch 750 output signal AFOD.
Driver 470 receives the signal SFOD that sends from switch 750, and is used to carry out the signal of focused search or focus servo to the driver output of optical pickup device 480.Optical pickup device 480 descends to the CD lifting or from CD in response to the signal output focus error signal FE from driver 470 outputs, promptly carries out focused search.
In this case, from just focusing drop point before occurring, promptly carry out focused search from signal LOUT from wave filter 7410 outputs.
Figure 12 is the schematic block diagram that has according to the focused search device of the focused search waveform generator of an alternative embodiment of the invention.
The structure of focused search device 800 shown in Figure 12 is identical with the structure of focused search device 700 shown in Figure 8, except the structure and operation of focused search waveform generator 840.Therefore, do not repeat the explanation of the like in two accompanying drawings at this.
840 receptions of focused search waveform generator are from the signal LPO of focusing ring mode filter 430 outputs and the signal SFOD that exports from switch 750.During focusing, the signal LPO that focused search waveform generator 840 receives and filtering is exported from focusing ring mode filter 430, and to switch 750 output signal LOUT.If after focusing is dropped, carry out focused search, then 840 additions of focused search waveform generator are from the signal of wave filter shown in Figure 13 7410 output, promptly by integrated mean value that obtains from the signal LPO of focusing ring mode filter 430 outputs and the triangular wave with preset range, and to switch 750 output signal AFOD.
Figure 13 is the schematic block diagram of focused search waveform generator 840 shown in Figure 12.Focused search waveform generator 840 comprises wave filter 7410, level adjuster 8420, subtracter 8430, totalizer 8440, counter 8450, first amplifier 8460, second amplifier 8470, level range storer 8480 and waveform generator 8490.
The signal LPO that wave filter 7410 filtering are exported from focusing ring mode filter shown in Figure 12 430, and to subtracter 8430 and totalizer 8440 output signal LOUT.Wave filter 7410 receives from the signal LPO of focusing ring mode filter 430 outputs, by integrated from 430 outputs of focusing ring mode filter signal LPO and calculating mean value, and during focused search to subtracter 8430 and totalizer 8440 output mean value LOUT.The structure of wave filter 7410 shown in Figure 8 is identical with the structure of wave filter 7410 shown in Figure 9.
Adjust the level adjuster 8420 of the scope of focused search and export predetermined values to subtracter 8430 and totalizer 8440 during focused search, this value can Be Controlled.
Subtracter 8430 receptions are from the signal LOUT of wave filter 7410 outputs and the signal of exporting from level adjuster 8420, deduct from the signal of level adjuster 8420 outputs from signal LOUT, and subtract each other the result to 8460 outputs of first amplifier from wave filter 7410 outputs.That is, subtracter 8430 calculates the lower limit of the scope of focused search.
Totalizer 8440 receive and addition from the signal LOUT of wave filter 7410 outputs with from the signal of level adjuster 8420 outputs, and export the result of additions to second amplifier 8470.That is, second amplifier 8470 calculates the upper limit of the scope of focused search.
First amplifier 8460 is controlled from the gain XG of the signal of subtracter 8430 outputs, and exports the controlled signal LMIN of its gain in response to the signal of exporting from counter 8450 to level range storer 8480.Second amplifier 8470 is controlled from the gain XG of the signal of totalizer 8470 outputs in response to the signal of exporting from counter 8450, and to the controlled signal LMAX of its gain of level range storer 8480 outputs.
Signal LMIN and LMAX that 8480 storages of level range storer are exported from first and second amplifiers 8460,8470, and to counter 8450 and waveform generator 8490 output signal LMIN and LMAX.
Counter 8450 receives and relatively from the signal SFOD of switch shown in Figure 12 750 outputs with from the signal LMIN and the LMAX of level range storer 8480 outputs, and to first amplifier 8460 and 8470 outputs of second amplifier signal corresponding to comparative result.
That is, counter 8450 is relatively from the upper limit LMAX of level range storer 8480 output with from the upper limit of the signal SFOD of switch 750 outputs, perhaps relatively from the lower limit LMIN of level range storer 8480 outputs with from the lower limit of the signal SFOD of switch 750 outputs.If upper limit LMAX is identical with the upper limit of signal SFOD lower limit identical or lower limit LMIN and signal SFOD, then counter 8450 is exported the value of the counting that rises.
Therefore, the gain response of first amplifier 8460 and second amplifier 8470 improves in the signal of exporting from counter 8450.
Waveform generator 8490 produces triangular wave AFOD, wave in its upper limit LMAX in being stored in level range storer 8480 and the scope between the lower limit LMIN, and waveform generator 8490 is to switch 750 output triangular wave AFOD.
Figure 14 illustrates from the waveform of the signal of focused search waveform generator shown in Figure 12 840 outputs.With reference to Figure 13 and 14, the summit CP1 of counter 8450 counting triangular waves is to the quantity of CP9.That is, the summit CP1 of triangular wave is the timing point that the number of times of focused search is carried out in expression to CP9.If do not satisfy focus condition, then the scope of triangular wave improves gradually.
Figure 15 illustrates from the waveform of the signal of switch shown in Figure 12 750 outputs.Operation referring now to Figure 12-15 explanation focused search device 800.
During focusing, driver 470 receives from the signal LPO of focusing ring mode filter 430 outputs, and optical pickup device 480 is in response to from the signal of driver 470 outputs and the data of playback of recorded on CD.
But,, carries out in focused search device 800 owing to focus on focused search once more if dropping, and then focused search is from just at the point that takes place to focus on before dropping.
When carrying out focused search, subtracter 8430 deducts the signal that level adjuster 8420 is exported from the signal LOUT from wave filter 7410 outputs, and exports the result who subtracts each other to first amplifier 8460.And totalizer 8440 additions are from the signal LOUT of wave filter 7410 output with from the signal of level adjuster 8420 outputs, and to the result of second amplifier, 8470 output additions.
First amplifier 8460 and second amplifier 8470 be ride gain XG in response to the signal of exporting from counter 8450, and to 8480 outputs of level range storer its controlled signal LMIN of gain and LMAX.
Waveform generator 8490 receives upper limit LMAX and lower limit LMIN from level range storer 8480, and produces triangular wave AFOD from the signal LOUT from wave filter 7410 outputs.Swing in the scope of triangular wave AFOD between upper limit LMX and lower limit LMIN.
The triangular wave AFOD=SFOD that counter 8450 receives upper limit LMAX/ lower limit LMIN and produced by waveform generator 8490 from level range storer 8480, and the upper limit/lower limit of comparison upper limit LMAX/ lower limit LMIN and triangular wave AFOD=SFOD.If upper limit LMAX/ lower limit LMIN equals the upper limit/lower limit of triangular wave AFOD=SFOD, then counter 8450 improves count value.Summit CP1, CP3, CP5, CP7 and CP9 shown in Figure 14 is upper limit LMAX, and summit CP2, CP4, CP6, CP8 are lower limit LMIN.
Take place to focus on after successfully carrying out focused search to drop, and therefore restart under the situation of focused search, the starting point of focused search is the focusing before the signal LOUT that just drops generation in focusing, promptly just exports from wave filter 7410.
Therefore, even the narrow range of focused search, focused search device 800 also can promptly be searched for focusing.
And, even after focusing, produce flaw indication or antidetonation signal ATSC, be suitable for too according to focused search method of the present invention.When having cut, impression of the hand or stain, dish produces flaw indication.Described flaw indication is caused by the signal of radio frequency amplifier output.And antidetonation signal ATSC is used to use the tracking error signal to detect vibrations from the outside.
As mentioned above, in according to focused search method of the present invention, when carrying out focused search once more after focusing is dropped, the starting point of focused search is in the focusing that just takes place to focus on before dropping.Even the narrow range of focused search also can promptly be searched for focusing.
Therefore, can use according to focused search method of the present invention to come often from the portable optical system that the outside is shaken, promptly to search for focusing.Thereby restore data promptly.
Figure 16 is the schematic block diagram according to the annular gain controller of the servo-drive system of one embodiment of the present of invention.Annular gain controller 900 shown in Figure 16 is controlled at the annular gain of the track seek servo in the optical system and/or the annular gain of focus servo.
Annular gain controller 900 comprises amplifier (or multiplier) 910, a plurality of totalizer 920,940 and 950, sine-wave producer 440, bandpass filter (BPF) 960, loop filter 970 and difference detector 980 mutually.The 26S Proteasome Structure and Function of sine-wave producer 440 shown in Figure 16 and Fig. 4 and sine-wave producer 440 shown in Figure 6 identical.
Amplifier 910 receives and amplifies from the tracking error signal TE or the focus error signal FE of the output of optical pickup device (not shown), and amplifies the result to totalizer 920 outputs.At this, G, promptly the factor of the gain of amplifier 910 or multiplier can be controlled by the user.
Totalizer 920 receives from the signal and the shifted signal OFFSET of amplifier 910 outputs, with the skew of compensation from the signal of amplifier 910 outputs, and has compensated the tracking error signal or the focus error signal of its skew to totalizer 940 and totalizer 950 outputs.Sine-wave producer 440 produces the sinusoidal wave OSIN with preset frequency and amplitude, and to totalizer 940 and difference detector 980 sine wave output OSIN mutually.
Totalizer 940 receptions and addition are from the sinusoidal wave OSIN of sine-wave producer 440 outputs and the signal of exporting from totalizer 920, promptly compensated the tracking error signal or the focus error signal of its skew, and exported the result of additions to totalizer 950 and loop filter 970.
Loop filter 970 receives from the signal of totalizer 940 outputs, controls from the gain NSK of the signal of totalizer 940 outputs, and exports its controlled tracking error signal of gain or focus error signal FOD to the driver (not shown).Actuator response is in tracking error signal or focus error signal FOD and drive the optical pickup device (not shown).
Totalizer 950 receive and addition from the signals of totalizer 920 and 940 outputs, and export the result of additions to BPF 960.BPF 960 receive and bandpass filtering from the signal of totalizer 950 outputs, and export by the signal FSIN of bandpass filtering to phase difference detector 980.
980 receptions of phase difference detector are from the signal OSIN of sine-wave producer 440 outputs and the signal FSIN that exports from BPF 960, compare differing and fixed phase between signal OSIN and FSIN, as 90 ° or pi/2, and to the gain control signal PER of loop filter 970 outputs corresponding to comparative result.
Loop filter 970 reduces or improves the gain that is input to the signal of loop filter 970 from first adder 940, and exports its controlled tracking error signal of gain or focus error signal FOD in response to gain control signal PER.Best, loop filter 970 is low-pass filters.
Figure 17 to 19 is figure of the input waveform of diagram annular gain controller 900 shown in Figure 16.With reference to Figure 16,980 receptions of phase difference detector are from the signal FSIN of BPF 960 outputs and the signal OSIN that exports from sine-wave producer device 440, compare differing and fixed phase between signal OSIN and FSIN, as 90 °, and to the gain control signal PER of loop filter 970 outputs corresponding to comparative result.Then, loop filter 970 is in response to gain control signal PER ride gain NSK.
For example, with reference to Figure 16 and 17, if be pi/2 from the signal FSIN of BPF 960 outputs with from differing between the signal OSIN of sine-wave producer 440 outputs, then the gain NSK of loop filter 970 is 1, i.e. 0dB.
With reference to Figure 16 and 18, if at the signal FSIN that exports from BPF 960 with from differing less than pi/2 between the signal OSIN of sine-wave producer 440 outputs, then the gain NSK of loop filter 970 is less than 1.Therefore, loop filter 970 improves its gain NSK in response to gain control signal PER.
With reference to Figure 16 and 19, if at the signal FSIN that exports from BPF 960 with from the pi/2 that differs by more than between the signal OSIN of sine-wave producer 440 outputs, then the gain NSK of loop filter 970 is greater than 1.Therefore, loop filter 970 reduces its gain NSK in response to gain control signal PER.
Promptly, phase difference detector 980 is relatively from the signal FSIN of BPF 960 outputs with from the fixed phase with each predetermined amount of time of differing between the signal OSIN of sine-wave producer 440 outputs, and to the gain control signal PER of loop filter 970 outputs corresponding to comparative result.Therefore, loop filter 970 improves or reduces its gain automatically in response to gain control signal PER.
Therefore, have according to the annular gain of the track seek servo of annular gain controller of the present invention or focus servo and controlled automatically.Thereby the stability with optical system of track seek servo or focus servo improves.
Though specifically illustrate and illustrated the present invention with reference to specific embodiment of the present invention, it will be understood by those skilled in the art that, under the situation that does not break away from the appended the spirit and scope of the present invention that claim limited, can carry out the various changes on form and the details.

Claims (24)

1. focused search device comprises:
Sine-wave producer produces sinusoidal wave;
The focusing ring mode filter receives and the filtering focus error signal, and the focus error signal of output filtering;
The focus condition detecting device, collectiong focusing OK signal and focus error signal detect focus condition, and output is corresponding to the control signal of testing result;
Switch is optionally exported in response to control signal from the signal of sine-wave producer output with from one of signal of focusing ring mode filter output;
Driver drives optical pickup device in response to the signal from switch output.
2. according to the focused search device of claim 1, if wherein carry out focused search, then drive optical pickup device in response to the amplitude of sine wave, if carry out focus servo, then the focus error signal in response to filtering drives optical pickup device.
3. focused search method comprises:
Reception, low-pass filtering and the signal that output is exported from the focusing ring mode filter during focusing;
Addition is used for the waveform of focused search and the signal of low-pass filtering during focused search,
Wherein, drop, then begin focused search from low-pass filter signal if take place to focus on.
4. according to the focused search method of claim 3, wherein during focused search, keep the signal of low-pass filtering.
5. according to the focused search method of claim 3, even wherein when producing flaw indication or antidetonation signal, also use described focused search method.
6. according to the focused search method of claim 3, wherein during focused search, the scope that is used for the waveform of focused search improves pro rata with the number of times of carrying out focused search.
7. focused search waveform generator comprises:
Wave filter receives and the low-pass filtering input signal, and the signal of output low-pass filtering;
Sine-wave producer produces sinusoidal wave during focused search;
Counter is connected to sine-wave producer, receives sine wave, the point of the sign modification that counting is sinusoidal wave, and the result of output counting;
Amplifier is connected to sine-wave producer, receives sine wave and controls sinusoidal wave amplitude in response to the signal of exporting from counter;
Totalizer, reception and addition are from the signal of the low-pass filtering of wave filter output and the signal of exporting from amplifier, and the result of output addition.
8. according to the focused search waveform generator of claim 7, wherein during focused search, keep from the low-pass filter signal of wave filter output.
9. focused search waveform generator comprises:
Wave filter receives and the filtering input signal, and the signal of output low-pass filtering;
Level regulator, the regulated value of output predetermined level;
Subtracter receives from the low-pass filter signal and the level adjustment value of wave filter output, and deducts the level adjustment value from the low-pass filter signal from wave filter output;
Totalizer, reception and addition are from the signal and the level adjustment value of the low-pass filtering of wave filter output;
First amplifier is connected to subtracter and controls in response to count signal from the gain of the signal of subtracter output;
Second amplifier is connected to totalizer and controls in response to count signal from the gain of the signal of totalizer output;
The level range storer receives and stores from the signal of first and second amplifiers output;
Waveform generator is created in the triangular wave of swinging in the scope of the signal of level range storer output;
Counter receives and relatively from the signal of waveform generator output with from the signal of level range storer output, and output is corresponding to the count signal of comparative result,
Wherein, the low-pass filter signal of signal of exporting from waveform generator from exporting from wave filter.
10. focused search method comprises:
Collectiong focusing OK signal, and definite logic state that focuses on the OK signal;
Produce focused search waveform according to definite result with Different Slope;
During focusing according to reception of one of described waveform and filtering focus error signal; And
During focused search with described waveform and filtered signal plus,
Wherein, drop, then begin focused search from described filtered signal if take place to focus on.
11. a controller that is used for the annular gain of Control Servo System, described controller comprises:
Sine-wave producer produces sinusoidal wave;
First adder receives and additive error signal and sine wave, and the output addition result;
Loop filter receives from the signal of first adder output, controls from the gain of the signal of first adder output, and exports its controlled signal that gains;
Second adder, reception and additive error signal and the signal of exporting from first adder, and the result of output addition;
Wave filter, reception and filtering are from the signal of second adder output;
The phase difference detector, reception sine wave and the signal of exporting from wave filter are compared differing with fixed phase between signal sinusoidal wave and that export from wave filter, and export the gain control signal corresponding to comparative result,
Wherein, the gain of control loop mode filter in response to gain control signal.
12. according to the controller of claim 11, wherein fixed phase is 90 degree.
13. according to the controller of claim 11, wherein error signal is corresponding to the signal from the wave filter output of going in ring.
14. according to the controller of claim 11, wherein error signal is that it is fed the winding line filter via optical pickup device from the signal of the wave filter output of going in ring.
15. according to the controller of claim 11, the wave filter that wherein goes in ring is a low-pass filter.
16. according to the controller of claim 11, its median filter is a bandpass filter.
17. according to the controller of claim 11, if wherein differ by more than fixed phase, the gain response of the wave filter that then goes in ring reduces in gain control signal, if differ less than fixed phase, the gain response of the wave filter that then goes in ring improves in gain control signal.
18. according to the controller of claim 11, wherein sine-wave producer comprises:
First multiplier has factor I;
Second multiplier has factor;
First adder, reception and addition are from the signal of first multiplier output and the signal of exporting from second multiplier;
Second adder receives and increase control signal and the signal exported from first adder mutually;
First delay cell is connected between the input node of the output node of second adder and first multiplier, receives from the signal of second adder output, and will be from the signal delay preset time of second adder output;
Second delay cell is connected between the input node of the input node of first multiplier and second multiplier, receives the input signal of first multiplier, and the input signal of first multiplier is postponed preset time;
The 3rd multiplier has factor III, receives from the signal of second adder output, and sine wave output.
19. a sine-wave producer is used to produce sinusoidal wave round-trip gain with Control Servo System, described sine-wave producer comprises:
First multiplier has factor I;
Second multiplier has factor;
First adder, reception and addition are from the signal of first multiplier output and the signal of exporting from second multiplier;
Second adder receives and increase control signal and the signal exported from first adder mutually;
First delay cell is connected between the input node of the output node of second adder and first multiplier, receives from the signal of second adder output, and will be from the signal delay preset time of second adder output;
Second delay cell is connected between the input node of the input node of first multiplier and second multiplier, receives the input signal of first multiplier, and the input signal of first multiplier is postponed preset time;
The 3rd multiplier has factor III, receives from the signal of second adder output, and sine wave output.
20. according to the sine-wave producer of claim 19, wherein control signal is a pulse signal.
21., wherein control sinusoidal wave frequency in response to factor I according to the sine-wave producer of claim 19.
22., wherein control sinusoidal wave amplitude in response to factor III according to the sine-wave producer of claim 19.
23. according to the sine-wave producer of claim 19, wherein first and second delay cells are d type flip flops.
24. according to the sine-wave producer of claim 19, wherein first and second delay cells can reset.
CNB2003101148050A 2002-11-07 2003-11-07 Focusing-searching device and method thereof Expired - Fee Related CN1333394C (en)

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
KR10-2002-0068859A KR100486277B1 (en) 2002-11-07 2002-11-07 Focus search apparatus and focus search method
KR68860/2002 2002-11-07
KR68860/02 2002-11-07
KR68859/02 2002-11-07
KR10-2002-0068860A KR100498455B1 (en) 2002-11-07 2002-11-07 Apparatus and method for controllng loop gain of the servo system
KR68859/2002 2002-11-07
KR69418/02 2002-11-09
KR69418/2002 2002-11-09
KR10-2002-0069418A KR100505647B1 (en) 2002-11-09 2002-11-09 Focus search method and focus search wave form generation circuit

Publications (2)

Publication Number Publication Date
CN1499499A CN1499499A (en) 2004-05-26
CN1333394C true CN1333394C (en) 2007-08-22

Family

ID=32234018

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2003101148050A Expired - Fee Related CN1333394C (en) 2002-11-07 2003-11-07 Focusing-searching device and method thereof

Country Status (3)

Country Link
US (1) US7616537B2 (en)
CN (1) CN1333394C (en)
TW (1) TWI239001B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7558165B2 (en) 2004-05-07 2009-07-07 Samsung Electronics Co., Ltd. Disc drive calibration with forced track traversing signal
JP4476141B2 (en) * 2005-03-16 2010-06-09 三洋電機株式会社 Focus servo introduction device
JP2010277658A (en) * 2009-05-29 2010-12-09 Hitachi-Lg Data Storage Inc Optical disk device and program
KR101558323B1 (en) * 2015-03-27 2015-10-12 보스웰코리아(주) Luminous device for automobile wheel
KR102267474B1 (en) 2015-05-11 2021-06-21 삼성전자주식회사 Vibration control device and comuputing device including the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000182250A (en) * 1998-12-15 2000-06-30 Ricoh Co Ltd Focus servo acquisition controller
JP2000348354A (en) * 1999-06-07 2000-12-15 Ricoh Co Ltd Focus servo pull-in device for optical disk
CN1345036A (en) * 2000-05-15 2002-04-17 松下电器产业株式会社 Optical disk device and phase-locked loop circuit

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5824060B2 (en) * 1979-06-08 1983-05-19 日本電信電話株式会社 Audio band multiplex transmission method
EP0191467B1 (en) * 1985-02-15 1991-03-27 Hitachi, Ltd. Optical disc apparatus
JP3407315B2 (en) 1992-09-30 2003-05-19 ソニー株式会社 Optical disk signal processing circuit and optical disk apparatus
EP0840304B1 (en) * 1993-04-02 2000-07-26 Sony Corporation Focusing servo system and focus servo acquisition enable method
US5642340A (en) * 1993-06-23 1997-06-24 Sharp Kabushiki Kaisha Device for controlling focus of an optical disk apparatus
JPH08203108A (en) * 1995-01-30 1996-08-09 Toshiba Corp Optical disk reproducing device
US5682372A (en) * 1995-08-22 1997-10-28 Sony Corporation Method and apparatus for playing back multilayer disk
KR0176897B1 (en) 1996-02-16 1999-04-15 구자홍 Focus search and focus auto-gain control method of optic disk player
US5848036A (en) * 1996-06-20 1998-12-08 Matsushita Electric Industrial Co., Ltd. Optical disk drive equipped with waveform equalizer and focus adjustment circuit
JP3850101B2 (en) 1996-06-20 2006-11-29 松下電器産業株式会社 Optical disk device
JPH1055546A (en) 1996-08-09 1998-02-24 Mitsubishi Electric Corp Optical disk control device
JPH10143879A (en) 1996-11-07 1998-05-29 Fujitsu Ltd Optical disk device
JP3651208B2 (en) * 1997-10-17 2005-05-25 ソニー株式会社 Optical recording medium drive device
US6490234B1 (en) * 1999-03-15 2002-12-03 Rohm Co., Ltd. Optical disk reproducing device
JP3734640B2 (en) * 1999-04-30 2006-01-11 ローム株式会社 Optical disk playback device
US7012858B1 (en) * 1999-12-10 2006-03-14 Lg Electronics Inc. Method for checking the existence of an optical disk using a focusing signal
JP3649282B2 (en) * 2001-08-06 2005-05-18 船井電機株式会社 Disk device and focusing servo starting method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000182250A (en) * 1998-12-15 2000-06-30 Ricoh Co Ltd Focus servo acquisition controller
JP2000348354A (en) * 1999-06-07 2000-12-15 Ricoh Co Ltd Focus servo pull-in device for optical disk
CN1345036A (en) * 2000-05-15 2002-04-17 松下电器产业株式会社 Optical disk device and phase-locked loop circuit

Also Published As

Publication number Publication date
TW200411651A (en) 2004-07-01
US7616537B2 (en) 2009-11-10
US20040090884A1 (en) 2004-05-13
TWI239001B (en) 2005-09-01
CN1499499A (en) 2004-05-26

Similar Documents

Publication Publication Date Title
US4232201A (en) Dithered center tracking system
JPH07169070A (en) Optical information recorder/reproducer
EP0390977B1 (en) Servo system for a disc player
US4901299A (en) Optical disk reading head controller
US7274640B2 (en) Apparatus and method for determining disc type
CN1333394C (en) Focusing-searching device and method thereof
US5590106A (en) Disc player having a plurality of reading means for reading information on a disc
CN101136217B (en) Periodic time self-adapting repeat controller used for blue-light high-density optical disk servo-system
US6791915B1 (en) Optical disc track access apparatus and method for optical disc reproducer
JPH08180624A (en) Device for reproducing optical disk and method therefor
CN100373475C (en) Tracking error signal generation device, tracking error signal generation method and tracking control method
US20020176333A1 (en) Calibration method for control device of optical storage medium drive
CN100431017C (en) Control unit and optical disk drive including the control unit
US20050018557A1 (en) Optical disk reproducing apparatus for compensating for tracking error by using real-time repetitive control and method of driving optical disk reproducing apparatus
CN101164107A (en) Method of mechanical shock detection and method and apparatus for recording data onto an optical disc
JP3359383B2 (en) Focus servo device
JPH07201059A (en) Adjusting device for transducer
CN1321412C (en) Automatic correction system for optical incident angle
JPH05114257A (en) Device for detecting abnormality of track servo
KR100486277B1 (en) Focus search apparatus and focus search method
CN103000193B (en) Optical disc apparatus
JPWO2013157166A1 (en) Tracking control method, tracking control apparatus, and optical disc apparatus
JPH10134380A (en) Tracking control device
CN101103398A (en) Optical disc actuator control at optimal bandwidth
JPS63181177A (en) Feed servo system for optical pickup

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20070822

Termination date: 20141107

EXPY Termination of patent right or utility model